Materials are classified by how easily they allow electrons to move through them. Conductors let them flow freely, while insulators hold onto them tightly.

Visual Representation

Comparing Materials

Property Conductors Insulators
Electron Bond Loose / “Sea of Electrons” Tightly bound to nuclei
Charge Flow Moves easily across surface Remains localized where placed
Examples Copper, Gold, Aluminum, Tap Water Rubber, Glass, Plastic, Dry Wood

💡 Quick Concept Check:

Why is a metal wire usually wrapped in plastic?

Click to Reveal Answer
The metal is a **conductor** used to transport electricity efficiently. The plastic is an **insulator** used to prevent the charge from escaping the wire and causing a short circuit or giving someone a shock.
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